It's not their fault, yeah, but when you are a maximalist, you can miss out other opportunities that could have earned you thousands or millionaire of dollars. There are lots of scams with the altcoin market but there are also some opportunities with a few tokens, but if you are not ready to risk it, better you only accumulate Bitcoin.
I think the failure of Altcoins is the reason why many of them has refused to accept them, right From ICO time there has never been any successful altcoins that has good reputation like Bitcoin, only ethereum come close but I always have issues with the maximum supply since nothing has been said about that supply but look at Bitcoin, it's just 21 maximum supply, no team, no foundation, no treasury, no ventures and all sort of seed rounds yets it's doing better.
However, I think there is nothing bad if you risk little. If you have had the opportunity to accumulate Bitcoin, the love and passion to see Bitcoin grow shouldn't stop one from looking at other opportunities. There are many alcoins that have printed life changing profits that you can take and still invest the money back into Bitcoin and you will be getting rich and richer in Bitcoin, that's what a smart maximalist should do and not hate every ideas.